Light transmission/reception probe system and light transmission/reception probe

A light transmission/reception probe system comprising:

• at least one light source;
• a light transmission/reception probe including
• a first end portion in an axial direction,
• a second end portion on an opposite side of the first end portion in the axial direction,
• a core,
• a first cladding enclosing the core, and
• a leak enabling section configured to enable leakage of first light from an outer periphery of the first cladding toward an outside in a radial direction, the first light being output from the light source, coupled with the first cladding in the first end portion, and transmitted through the first cladding;
• a light receiving unit configured to receive second light, the second light arriving from an outside, being coupled with the core in the second end portion, being transmitted through the core, and being output from the core in the first end portion;
• and
• a detecting unit configured to detect the second light received by the light receiving unit.